{
    return "check_smtp_forward" if $DelegateMailServer;

    use esmith::DomainsDB;
    my $ddb = esmith::DomainsDB->open_ro();

    for my $domain ( $ddb->domains )
    {
        return "check_smtp_forward" if $domain->prop('MailServer');
    }

    return "# check_smtp_forward not required";
}
